The smallest wing I ever built for .049 power was 105 sq inches. The plane didn't have much glide at about 10-11 ozs but it was definitely able to safely land. Your plane will be much lighter. You can cut the wing out completely to get your aileron servo buried as deep as possible. I've also seen the aileron servo laid flat with crazy looking pushrods to connect to the torque rods. You've got to be militant about weight, but I don't know anything about choosing servos this small. Go with the smallest ones you dare use and don't spend a lot of time making the plane look too pretty.
The plastic sleeve in the venturi ought to still let you have the needle off to the side. I think Dickeybird had an informational thread about inserting a sleeve in a TD .049 venturi, [to make it run better on suction] but I can't remember if he had to machine a sleeve [on a drill press], or if he found a common household item to do it.